Improvement in grinding-machines



5 Sheets- -Sheet 2.

L. 'BOLLMANN.

GRINDING-MACHINE. No. 192,144. Paitentecl J'une19,1877.

a i 6% I q BY ATTORNEYS;

warms PfiOTQ-UTHOGRAFHER, WASHINGTON, 0 e.

5Sheets+$hest 3. L. BOLLMANN.' GRINDING-MACHINE.

Na. 192,144. atented June19 ,1 877,

I monuns N- PETERS, FHOT0 LITH0GRAPHERA WKSHINGTON, D,

5 Sheets- Sheet 4. L. BOLLMAN'N. k GRINDING-MACHINE.

Patented Jun.e,1 9, 1877.

- maxim N. PETERS, PHOTO-LIfHDGRAPHER, WASHINGTON DYC.

UNIT D STATES PATENT 'OFFIoE.

LOUIS BOLLM-ANN, OF.VIENNA, AUSTRIA.

IMPROVEMENT IN GR lNDING-MACHINES.

Specification forming part of Letters Patent No. 192,144, dated June 19,1877 application filed September 1, 1876.

To all 'whom it may concern Be it known that I, LoUIs .BOLLMANN, ofVienna, in the Empire of Austria, have invented a new and ImprovedGrinding-Machine, of which the following is a specification:

The invention relates to an improved machine for grinding any article,by means of emery-wheels, in a perfect manner, by feeding the work by anelastic yielding press ure to the emery-wheel, and controlling thegrinding process, and preventing any danger from the bursting of thewheel.

The invention consists of an emery grinding-machine, with areciprocating slide-rest that feeds the work with yielding pressure, andallows the grinding action of the emerywheel during the forward motiononly of the slide rest. The slide-rest and its operating mechanism arelaterally movable for adjustment in the main frame.

A hood mounted on an elastic support over the emery-wheel guards againstdanger from a bursting emery-wheel.

chine. Fig. 3 is a top view of the same, the

upper slide-rest being removed, and also the emery-wheel, the arms forsupporting the latter being shown in section. Fig. 4 isa plan view ofthe mechanism for changing the position of the slide-rest. tional viewof the clutch, attached to the principal gear which operates the slidingtable upon which the work is placed. Fig. 6 is a detail view, in sideelevation, of the chief mechanism for operating the sliding table.

The other figures represent details of this machine, to which I willrefer in the following description: I

The machine rests on the under frame A, which is fastened to the mainbody A, having two arms projecting upward for the bearings, in which thespindle of the emery-wheel freely revolves. Holes are formed in the armsA to receive the long bolts b on both ends, to which are fastened thetwo spring steel bars a a that carry the protecting hood H,'so that thelatter can be'adjusted to suit the size and position of the emery-wheelH. V

Fig. 5 is a detail sec- This arrangement of the bolts b,the bars a, andthe hood H is in its nature such that the hood is adapted to yield, sothat in case the emery-wheel bursts the great shock will not break thearms A of the main frame, but its force will be effectually taken up bythe springbars'a without doing any harm. Practice has shown that suchelastic spring-commotion of the hood is the surest way to preventaccidents to the workmen, and breakage of the machinery. Ofcourse theform ofthe springbar and the connection must be varied according to thecircumstances, or to the form under which the emery-wheel is used.

To the lower part of the main frame A is connected the vertical slide B,which carries the slide-rest withits mechanism, so that it can be raisedor lowered by means of a set-- screw, to which is fastened a hand-wheel,d, Fig. 1, for the purpose of accommodating the height of the bed towhich the work is fastened to the size of the emery-wheel, or to thethickness of the tool to be ground. This vertical slide B has two armswith bearings e c, in which slides freely the long shaft 6, to

which the bed B is fastened. This shaft 6 is provided with teeth on itsend, into which gears a pinion, having a hand-wheel, e Fig. 3, so thatby turning this band-wheel the shaft 0, and with it the bed B, and theupper sliderest can be moved to the right or left in order to feed thework sideways under the emerywheel.

The front side of bed B rests on the sliding shaft 0, as aboveexplained, andthe other side on a plane surface, B extending backward,and forming part of the vertical slide B. On the bed B (top view in Fig.3, inside view in Fig. 14) are four short oblique bearin g surfaces f,on which rest the friction-rolls f, which are fastened on two smallshafts that support the horizontal slide-rest O. The sliderest 0 forms,therefore, a wagon with four wheels resting on the four oblique surfacesf. Now, when this slide-restO is moved forward it will rise on theiuclinesf, and con trarywise whenit is moved backward; it will belowered, while at the same time it will be kept perfectly horizontal. V

The sliding table D, on which the work to be ground isiastened in anysuitable manner, rests on the slide-rest O, and receives its back= wardand forward motion by the toothed segment-lever G, to which it isconnected by the 'rod G fastened at one end to the under side of thetable, and at the other end to the extreme end of the lever G, Fig. 2.The toothed segmental-lever G receives its motion by a toothed wheel, F,having a bearing in the eye F of the movable arm F, Figs. 2 and 15,having its fulcrum at g on the bed B This wheel F has thus, so much sideplay that its center will change its position, so as to keep the teethin continuous gear with the teeth of the segment G, the change takingplace on the end of each back or forward motion of the segmentlever.

, When the wheel F is in gear, or mesh with the longer side of segmentG, the table is fed forward, and when 111 gear with the shorter side ofsaid segment the table is fed backward. Owing to the difference betweenthe distances of these toothed sides of the segment from fulcrum G thebackward movement is twice as fast as the forward movement.

The toothed part of the segment is made in two parts, in order to beable to change the length of the motions by lengthening or shorteningthe inside toothed space. The separate toothed arm G3 can be turned onthe center G and fastened in any position to the arm G by means of thescrews, Fig. 3. The shaft G of the segment G has its bearing in an arm,G fastened to the sliding shaft 0 Figs. 2 and 3. The shaft of the wheelF carries on its under end one part of the universal joint h. A ringwith four bearing-screws connects this with the under part of the joint,which is east on a long, hollow, and slotted shaft, F in which slides upand down freely a solid shaft, F, a key so connecting both shaftstogether that they must turn together, forming one shaft that can. belengthened or shortened, so as to accommodate itself to the changableposition in height of the slide-rest. On the under end of shaft F isanother universal joint, h, which connects it to the screw wheel E thatrests in a step fastened into the under part of the frame A, andreceives a continuous motion from a worm, E on a horizontal shaft whichis driven from the countershafting by a belt passing on the pulley GFig. 1.

This now-explained combination gives to the wheel F a continuousrotating motion. The means for keeping the wheel F in mesh with thesegment G consists of a locking-bar,

E, pivoted to a stud on the bearing G of the toothed segment G, andsupported in horizontal position by a plate-spring, e. Said bar E has alug or projection, u, near its outer end, and a raised portion,.e nearits inner end. The lug u engages a corresponding lug, to, on the underside of the arm E", which is pivoted 'on sleeve on bearing G. This armalso has lugs e e on the upper side. Guide' flanges or lugs e e areattached to the under side of the segment G, and a cam projection isprovided at 6 l92ql44 tact.

When the wheel F approaches the front end of the segment G it is held inmesh partly by the guide-lug e, which works against the lug 0 of arm E",and the locking-bar E must also be changed from the position shown inFig. 1 to that shown in Fig. 6, so that its locking-lug will pass to theopposite side of the lug on arm E", and thus hold the wheel in mesh withthe opposite or shorter side of the segmcntG. This is effected by thecam 6 which strikes the projection c of bar E, thus forcing the latterdown against the tension of spring 0 when the continued rotation ofwheel F carries it around to the position which allows the locking-lug uto lock with lug a of arm E", as shown in Fig. 6, which position ismaintained until the wheel reaches the rear end of the segment and thetable has been fed back.

It is necessary that the bed-table D can be instantly stopped or set inmotion; the wheel F is therefore connected to its shaft by afrietion-clutch, as shown in Fig. 5 in section. A pointed screw, '5,having a hand-wheel, i is screwed through the center of the shaft, andpresses with its conical point against two headed bolts, which actagainst the hollow part of the wheel when the screw is tightened,producing so much friction as required to carry the wheel with it. Whenthe screw is loosened the shaftwill revolve without the wheel. Theslide-rest O has also a movement to the right or left, which can beincreased or diminished, or stopped entirely, and also changed in itsdirection from right to left, or from left to right. The parts of thismechanism are below the table, and can therefore not well be seen in themain figures. Their mutual position is shown in the diagrams, Figs. 4and18, the first being a. top view, and the latter a partly-sectional sideview.

B is the vertical slide. F is the movable arm, which carries in the eyeF the shaft F of the wheel F, and is itself fastened on a shaft,socketed in an eye, B of the bed B Figs. 15 and 20. On the under end ofthis shaft is fastened the arm 2'. Now, by the action of the wheel Fwith the segmental arm G, the arm F will receive a short reciprocatingmotion at each stroke of the arm G, which motion is imparted to theunder part or arm 2'. This part has a crank-pin, 9 on which turns thelong bar 11 that is toward the left supplied with a pin, i Figs. 15 and19, which works in a curved slot of the lever l, Figs. 9, 10, and 11,thus imparting its motion to that lever. The left end of this bar 2'passes the latter.

1 backward.

through a slot, w, Fig.15, in'the' bed B in which its position' can beadjusted by means, of a pin, i entering the notches formed on;

.the bed of the slot, so that the pin 2' will gear in the slot ot'l nearor farther from the axis of y m is a second similar pallet, that isjointed by a pin to the under side of the bed B, and also gears into theslot 1 Fig. 4 shows that both these pallets are connectedto the lever;12, jointed to the bed B by means of two rods 1 and four spiral springs.

Now, when the lever 11. is movedby hand to the right or left, thesprings will pull both pallets with an elastic pressure in the samedirection, whereby their projection will catch or jam themselves intothe slot Z in one direction,

while it will move quite freely in the other direction. It is the sameprinciple as is applied by the cloth-feeding wheel of the Howe sewingmachine, except that in this case the pressure is in a straight line ordirection. The other end of the pallet 1 being moved by the lever n inone direction, the square projection will slide, by the force of thespring, along in the slot; but when the lever moves in the contrarydirection, the pallet cannot slide in the slot, but will act as afulcrum, thereby moving the whole slide-rest. The second pallet m isonly to prevent the slide-rest moving Accordingly as the lever to is setto the left or to the right, the feed of the slide rest will also be inthe same direction, and when it is set in the middle, as shown in Fig.8, the pallets will not be pressed in any direction, and then there willbe no motion given to the slide-rest.

[t is necessary the table with the work shall be slightly lowered whenthe work is going backward, in the direction of the motion of theacting-surface of the emery-wheel, while it is raised to bring the workin contact with the emery-wheel when moving forward. At the same timethe pressure of the work against the emery-wheel must be a yielding orelastic one, which can be regulated at will, according to the conditionof the work. This is accomplished in this machine in the follow ingmanner: The part or arm 7? acts against the lever 0, (see Figs. 12, 13,4, and 18,) which turns on an eye, i Figs; 18 and 20, on

the bed B, so as to impart a small motion to it at the moment when thewheel F is changing its position. Against a tooth of this lever reststhe end of the screw-spindlep, which works in two bearings in the bed B,and is pressed against the tooth of 0 by a strong spiral spring, 10 Fig.3. On the screw of this spindle is a nut, 10 to which the lever q isconnected. The lever is arranged in an oblique position, and pivoted bya stud, on which When this pin gears near to the axis the motion of thelever I will be gr'eatera it tur'ns,to the under side of the bed B Thisarmq has an extension, g, which carries a friction-roll, that bearsagainst the inner edge of the projection i", forming part of thesliderest U. (See Fig. 16.)

Now, when the tooth of O is striking against the end of spindle'p,pushing it toward the left, the nut 11 will impart this motion to thelever q and its projection q, thereby allowing the bed B to sinkslightlydownward on the four inclined surfaces f whereby the sliderest will belowered, so that the emery-wheel cannot touch the work. When the lever Ois set free from the tooth then the spring 11 will force the spindle tothe right, and with it the lverq and its friction-roller q, which willpush the slide-rest (J forward, and thus raise it upward on the fourinclines f, as described. The slide-rest-isthus held upward by thetension of the spring'pl, so that whena greater pressure pushes theslide-rest downward, as the tension allows, the table must yield. Thistension of the spring 10 can be regulated by the small hand-screw p. Thespindle p can be turned by the hand-wheel 10, whereby the position ofthe nut 19 and the lever q will be altered, and the slide-rest sethigher or lower, so as to adjust the height of the work very exactly,while the range of the small upward and downward motion at each strokewill remain the same.

0n the front and back ends of the slide-rest 0, Figs. 2, 15, and 16, aretwo rollers, '1", over which pass two pieces of leather or cloth,fastened to the upper table D, and having weights attached to keep themstretched. They'serve to protect the mechanism below and the slides fromthe dust made by the emery-wheel.

To lead away this dust, and also the metal ground away, there is ascreen of sheet metal,

I, placed behind the emery-wheel, (see Fig. 2,) of such shape andposition as to catch the stream of filings anddust, and lead it directlyinto the tray 1', which is filled with water.

To prevent certain kinds of Work from getting unduly heated by theaction of the emery-wheel, I use the following arrangement, (shown inaction in Fig. 21:) O is the slide rest, on which slides the table D onwhichthe work to be ground by the emery-wheel H is fastened, in such amanner that a free space is left between the table and the under side ofthe work. In this space is placed a hollow vessel or tube, l connectedto an elastic rubber tube, passing downward from a large reservoir ofwater placed on an elevated position. The vessel is perforated with verytine holes, through which squirt fine streams of water against the undersurface of the work, whereby thelatter is kept cool while being ground.The waste-watcr'is led off the sides of the table into long channels,formed on the sides of the slide-rest G, from where it is led off bytubes below the machine.

Having thus described my invention, I claim as new and desire to secureby Letters Patentmade 1. In a grinding-machine, the combination. of thesupports of the emery-wheel with a pro jecting hood, applied to elasticspring-bars or. springs to take up the shock of a bursting wheel,substantially asdescribed.

2. The combination of the slide-rest O, having friction-rollers, withthe bed 15, having inclines, whereby the table is adapted to be raisedand lowered, as shown and described.

3. The combination of the toothed segmentlever G with thecontinnously-revolving g'earf Wheel F and the adjustable toothed sectionG to lengthen or shorten the stroke of the slide-table, substantially asspecified.

4. The combination of the gear-wheel F with the universal joint anddouble transmitting shaft to follow the up-and-down motion ofslide-rest, substantially as described.

5. The combination of the slide-rest with the;

friction-pallets and lever mechanism, arran ged to operate in bothdirections to produce auto 7. The combination, in a grinding-machine,

of a vertically-sliding support, B, a swinging bed, B seated thereon,and rising-and-fallin g slide-rest, and a reciprocating slide table forthe work, substantially in the manner and for the purpose set forth.

LOUIS BOLLMANN.

Witnesses WILLIAM HINING, FERDINAND FIGK.

